The Engines
These take the results of a search and break it into subsets. For instance, if I search for "journalism," I might be then given the opportunity to search within the categories of "reporting" and "journalism training" and so forth.
Some other sites also do this, but these seem the best at it, from what I have seen. Google does it sometimes, but the list is at the bottom of the search results and easy to miss.
Vivisimo Clustering Engine
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Blog Posts via Google
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